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From mwa...@apache.org
Subject [07/13] accumulo-website git commit: Jekyll build from master:7cc70b2
Date Mon, 22 May 2017 17:31:54 GMT
http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/7b2eb317/docs/unreleased/development/analytics.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+<!--
+    Licensed to the Apache Software Foundation (ASF) under one or more
+    contributor license agreements.  See the NOTICE file distributed with
+    this work for additional information regarding copyright ownership.
+    The ASF licenses this file to You under the Apache License, Version 2.0
+    (the "License"); you may not use this file except in compliance with
+    the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
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+<link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
+<link rel="stylesheet" type="text/css" href="https://cdn.datatables.net/v/bs/jq-2.2.3/dt-1.10.12/datatables.min.css">
+<link href="/css/accumulo.css" rel="stylesheet" type="text/css">
+
+<title>Accumulo Documentation - Analytics</title>
+
+<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
+<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
+<script type="text/javascript" src="https://cdn.datatables.net/v/bs/jq-2.2.3/dt-1.10.12/datatables.min.js"></script>
+<script>
+  // show location of canonical site if not currently on the canonical site
+  $(function() {
+    var host = window.location.host;
+    if (typeof host !== 'undefined' && host !== 'accumulo.apache.org') {
+      $('#non-canonical').show();
+    }
+  });
+
+  $(function() {
+    // decorate section headers with anchors
+    return $("h2, h3, h4, h5, h6").each(function(i, el) {
+      var $el, icon, id;
+      $el = $(el);
+      id = $el.attr('id');
+      icon = '<i class="fa fa-link"></i>';
+      if (id) {
+        return $el.append($("<a />").addClass("header-link").attr("href", "#" + id).html(icon));
+      }
+    });
+  });
+  
+  // configure Google Analytics
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+    ga('send', 'pageview');
+  }
+</script>
+
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+<body style="padding-top: 100px">
+
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+
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+          Visit the official site at: <a href="https://accumulo.apache.org">https://accumulo.apache.org</a>
+        </div>
+        <div id="content">
+          
+          <div class="alert alert-danger" role="alert">This documentation is for an unreleased version of Apache Accumulo that is currently under development! Check out the <a href="/docs-1.8/">documentation for the latest release</a>.</div>
+
+<div class="row">
+  <div class="col-md-3">
+    <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
+      <div class="panel panel-default">
+      
+      
+      
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+          
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+          
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+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsegetting-started" aria-expanded="false" aria-controls="collapsegetting-started">
+                  Getting started
+                </a>
+              </h4>
+            </div>
+            <div id="collapsegetting-started" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/design">Accumulo Design</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/clients">Accumulo Clients</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/shell">Accumulo Shell</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/table_design">Table Design</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/table_configuration">Table Configuration</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+      
+        
+          
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsedevelopment" aria-expanded="true" aria-controls="collapsedevelopment">
+                  Development
+                </a>
+              </h4>
+            </div>
+            <div id="collapsedevelopment" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/iterator_design">Iterator Design</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/iterator_testing">Iterator Testing</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/development_tools">Development Tools</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/sampling">Sampling</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/summaries">Summary Statistics</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/security">Security</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/high_speed_ingest">High-Speed Ingest</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/analytics">Analytics</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+          
+        
+      
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseadministration" aria-expanded="false" aria-controls="collapseadministration">
+                  Administration
+                </a>
+              </h4>
+            </div>
+            <div id="collapseadministration" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/overview">Overview</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/configuration-management">Configuration Management</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/configuration-properties">Configuration Properties</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/kerberos">Kerberos</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/replication">Replication</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/fate">FATE</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/multivolume">Multi-Volume Installations</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/ssl">SSL</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+          
+        
+          
+        
+      
+        
+          
+        
+          
+        
+          
+        
+          
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsetroubleshooting" aria-expanded="false" aria-controls="collapsetroubleshooting">
+                  Troubleshooting
+                </a>
+              </h4>
+            </div>
+            <div id="collapsetroubleshooting" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/troubleshooting/overview">Overview</a></div>
+                
+              </div>
+            </div>
+          
+        
+      
+      </div>
+    </div>
+  </div>
+  <div class="col-md-9">
+    
+    <p><a href="/docs/unreleased/">Accumulo unreleased docs</a> &nbsp;&gt;&gt;&nbsp; Development &nbsp;&gt;&gt;&nbsp; Analytics</p>
+    
+    
+    <h1>Analytics</h1>
+    
+    <p>Accumulo supports more advanced data processing than simply keeping keys
+sorted and performing efficient lookups. Analytics can be developed by using
+MapReduce and Iterators in conjunction with Accumulo tables.</p>
+
+<h2 id="mapreduce">MapReduce</h2>
+
+<p>Accumulo tables can be used as the source and destination of MapReduce jobs. To
+use an Accumulo table with a MapReduce job (specifically with the new Hadoop API
+as of version 0.20), configure the job parameters to use the AccumuloInputFormat
+and AccumuloOutputFormat. Accumulo specific parameters can be set via these
+two format classes to do the following:</p>
+
+<ul>
+  <li>Authenticate and provide user credentials for the input</li>
+  <li>Restrict the scan to a range of rows</li>
+  <li>Restrict the input to a subset of available columns</li>
+</ul>
+
+<h3 id="mapper-and-reducer-classes">Mapper and Reducer classes</h3>
+
+<p>To read from an Accumulo table create a Mapper with the following class
+parameterization and be sure to configure the AccumuloInputFormat.</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">class</span> <span class="nc">MyMapper</span> <span class="kd">extends</span> <span class="n">Mapper</span><span class="o">&lt;</span><span class="n">Key</span><span class="o">,</span><span class="n">Value</span><span class="o">,</span><span class="n">WritableComparable</span><span class="o">,</span><span class="n">Writable</span><span class="o">&gt;</span> <span class="o">{</span>
+    <span class="kd">public</span> <span class="kt">void</span> <span class="nf">map</span><span class="o">(</span><span class="n">Key</span> <span class="n">k</span><span class="o">,</span> <span class="n">Value</span> <span class="n">v</span><span class="o">,</span> <span class="n">Context</span> <span class="n">c</span><span class="o">)</span> <span class="o">{</span>
+        <span class="c1">// transform key and value data here</span>
+    <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p>To write to an Accumulo table, create a Reducer with the following class
+parameterization and be sure to configure the AccumuloOutputFormat. The key
+emitted from the Reducer identifies the table to which the mutation is sent. This
+allows a single Reducer to write to more than one table if desired. A default table
+can be configured using the AccumuloOutputFormat, in which case the output table
+name does not have to be passed to the Context object within the Reducer.</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">class</span> <span class="nc">MyReducer</span> <span class="kd">extends</span> <span class="n">Reducer</span><span class="o">&lt;</span><span class="n">WritableComparable</span><span class="o">,</span> <span class="n">Writable</span><span class="o">,</span> <span class="n">Text</span><span class="o">,</span> <span class="n">Mutation</span><span class="o">&gt;</span> <span class="o">{</span>
+    <span class="kd">public</span> <span class="kt">void</span> <span class="nf">reduce</span><span class="o">(</span><span class="n">WritableComparable</span> <span class="n">key</span><span class="o">,</span> <span class="n">Iterable</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">&gt;</span> <span class="n">values</span><span class="o">,</span> <span class="n">Context</span> <span class="n">c</span><span class="o">)</span> <span class="o">{</span>
+        <span class="n">Mutation</span> <span class="n">m</span><span class="o">;</span>
+        <span class="c1">// create the mutation based on input key and value</span>
+        <span class="n">c</span><span class="o">.</span><span class="na">write</span><span class="o">(</span><span class="k">new</span> <span class="n">Text</span><span class="o">(</span><span class="s">"output-table"</span><span class="o">),</span> <span class="n">m</span><span class="o">);</span>
+    <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<p>The Text object passed as the output should contain the name of the table to which
+this mutation should be applied. The Text can be null in which case the mutation
+will be applied to the default table name specified in the AccumuloOutputFormat
+options.</p>
+
+<h3 id="accumuloinputformat-options">AccumuloInputFormat options</h3>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">Job</span> <span class="n">job</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Job</span><span class="o">(</span><span class="n">getConf</span><span class="o">());</span>
+<span class="n">AccumuloInputFormat</span><span class="o">.</span><span class="na">setInputInfo</span><span class="o">(</span><span class="n">job</span><span class="o">,</span>
+        <span class="s">"user"</span><span class="o">,</span>
+        <span class="s">"passwd"</span><span class="o">.</span><span class="na">getBytes</span><span class="o">(),</span>
+        <span class="s">"table"</span><span class="o">,</span>
+        <span class="k">new</span> <span class="nf">Authorizations</span><span class="o">());</span>
+
+<span class="n">AccumuloInputFormat</span><span class="o">.</span><span class="na">setZooKeeperInstance</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="s">"myinstance"</span><span class="o">,</span>
+        <span class="s">"zooserver-one,zooserver-two"</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p><strong>Optional Settings:</strong></p>
+
+<p>To restrict Accumulo to a set of row ranges:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Range</span><span class="o">&gt;</span> <span class="n">ranges</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Range</span><span class="o">&gt;();</span>
+<span class="c1">// populate array list of row ranges ...</span>
+<span class="n">AccumuloInputFormat</span><span class="o">.</span><span class="na">setRanges</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="n">ranges</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p>To restrict Accumulo to a list of columns:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Pair</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">,</span><span class="n">Text</span><span class="o">&gt;&gt;</span> <span class="n">columns</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Pair</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">,</span><span class="n">Text</span><span class="o">&gt;&gt;();</span>
+<span class="c1">// populate list of columns</span>
+<span class="n">AccumuloInputFormat</span><span class="o">.</span><span class="na">fetchColumns</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="n">columns</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p>To use a regular expression to match row IDs:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">IteratorSetting</span> <span class="n">is</span> <span class="o">=</span> <span class="k">new</span> <span class="n">IteratorSetting</span><span class="o">(</span><span class="mi">30</span><span class="o">,</span> <span class="n">RexExFilter</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
+<span class="n">RegExFilter</span><span class="o">.</span><span class="na">setRegexs</span><span class="o">(</span><span class="n">is</span><span class="o">,</span> <span class="s">".*suffix"</span><span class="o">,</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">null</span><span class="o">,</span> <span class="kc">true</span><span class="o">);</span>
+<span class="n">AccumuloInputFormat</span><span class="o">.</span><span class="na">addIterator</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="n">is</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<h3 id="accumulomultitableinputformat-options">AccumuloMultiTableInputFormat options</h3>
+
+<p>The AccumuloMultiTableInputFormat allows the scanning over multiple tables
+in a single MapReduce job. Separate ranges, columns, and iterators can be
+used for each table.</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">InputTableConfig</span> <span class="n">tableOneConfig</span> <span class="o">=</span> <span class="k">new</span> <span class="n">InputTableConfig</span><span class="o">();</span>
+<span class="n">InputTableConfig</span> <span class="n">tableTwoConfig</span> <span class="o">=</span> <span class="k">new</span> <span class="n">InputTableConfig</span><span class="o">();</span>
+</code></pre>
+</div>
+
+<p>To set the configuration objects on the job:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">InputTableConfig</span><span class="o">&gt;</span> <span class="n">configs</span> <span class="o">=</span> <span class="k">new</span> <span class="n">HashMap</span><span class="o">&lt;</span><span class="n">String</span><span class="o">,</span><span class="n">InputTableConfig</span><span class="o">&gt;();</span>
+<span class="n">configs</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"table1"</span><span class="o">,</span> <span class="n">tableOneConfig</span><span class="o">);</span>
+<span class="n">configs</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"table2"</span><span class="o">,</span> <span class="n">tableTwoConfig</span><span class="o">);</span>
+<span class="n">AccumuloMultiTableInputFormat</span><span class="o">.</span><span class="na">setInputTableConfigs</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="n">configs</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p><strong>Optional settings:</strong></p>
+
+<p>To restrict to a set of ranges:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Range</span><span class="o">&gt;</span> <span class="n">tableOneRanges</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Range</span><span class="o">&gt;();</span>
+<span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Range</span><span class="o">&gt;</span> <span class="n">tableTwoRanges</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Range</span><span class="o">&gt;();</span>
+<span class="c1">// populate array lists of row ranges for tables...</span>
+<span class="n">tableOneConfig</span><span class="o">.</span><span class="na">setRanges</span><span class="o">(</span><span class="n">tableOneRanges</span><span class="o">);</span>
+<span class="n">tableTwoConfig</span><span class="o">.</span><span class="na">setRanges</span><span class="o">(</span><span class="n">tableTwoRanges</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p>To restrict Accumulo to a list of columns:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Pair</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">,</span><span class="n">Text</span><span class="o">&gt;&gt;</span> <span class="n">tableOneColumns</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Pair</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">,</span><span class="n">Text</span><span class="o">&gt;&gt;();</span>
+<span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Pair</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">,</span><span class="n">Text</span><span class="o">&gt;&gt;</span> <span class="n">tableTwoColumns</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">Pair</span><span class="o">&lt;</span><span class="n">Text</span><span class="o">,</span><span class="n">Text</span><span class="o">&gt;&gt;();</span>
+<span class="c1">// populate lists of columns for each of the tables ...</span>
+<span class="n">tableOneConfig</span><span class="o">.</span><span class="na">fetchColumns</span><span class="o">(</span><span class="n">tableOneColumns</span><span class="o">);</span>
+<span class="n">tableTwoConfig</span><span class="o">.</span><span class="na">fetchColumns</span><span class="o">(</span><span class="n">tableTwoColumns</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p>To set scan iterators:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">List</span><span class="o">&lt;</span><span class="n">IteratorSetting</span><span class="o">&gt;</span> <span class="n">tableOneIterators</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">IteratorSetting</span><span class="o">&gt;();</span>
+<span class="n">List</span><span class="o">&lt;</span><span class="n">IteratorSetting</span><span class="o">&gt;</span> <span class="n">tableTwoIterators</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">IteratorSetting</span><span class="o">&gt;();</span>
+<span class="c1">// populate the lists of iterator settings for each of the tables ...</span>
+<span class="n">tableOneConfig</span><span class="o">.</span><span class="na">setIterators</span><span class="o">(</span><span class="n">tableOneIterators</span><span class="o">);</span>
+<span class="n">tableTwoConfig</span><span class="o">.</span><span class="na">setIterators</span><span class="o">(</span><span class="n">tableTwoIterators</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p>The name of the table can be retrieved from the input split:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kd">class</span> <span class="nc">MyMapper</span> <span class="kd">extends</span> <span class="n">Mapper</span><span class="o">&lt;</span><span class="n">Key</span><span class="o">,</span><span class="n">Value</span><span class="o">,</span><span class="n">WritableComparable</span><span class="o">,</span><span class="n">Writable</span><span class="o">&gt;</span> <span class="o">{</span>
+    <span class="kd">public</span> <span class="kt">void</span> <span class="nf">map</span><span class="o">(</span><span class="n">Key</span> <span class="n">k</span><span class="o">,</span> <span class="n">Value</span> <span class="n">v</span><span class="o">,</span> <span class="n">Context</span> <span class="n">c</span><span class="o">)</span> <span class="o">{</span>
+        <span class="n">RangeInputSplit</span> <span class="n">split</span> <span class="o">=</span> <span class="o">(</span><span class="n">RangeInputSplit</span><span class="o">)</span><span class="n">c</span><span class="o">.</span><span class="na">getInputSplit</span><span class="o">();</span>
+        <span class="n">String</span> <span class="n">tableName</span> <span class="o">=</span> <span class="n">split</span><span class="o">.</span><span class="na">getTableName</span><span class="o">();</span>
+        <span class="c1">// do something with table name</span>
+    <span class="o">}</span>
+<span class="o">}</span>
+</code></pre>
+</div>
+
+<h3 id="accumulooutputformat-options">AccumuloOutputFormat options</h3>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="kt">boolean</span> <span class="n">createTables</span> <span class="o">=</span> <span class="kc">true</span><span class="o">;</span>
+<span class="n">String</span> <span class="n">defaultTable</span> <span class="o">=</span> <span class="s">"mytable"</span><span class="o">;</span>
+
+<span class="n">AccumuloOutputFormat</span><span class="o">.</span><span class="na">setOutputInfo</span><span class="o">(</span><span class="n">job</span><span class="o">,</span>
+        <span class="s">"user"</span><span class="o">,</span>
+        <span class="s">"passwd"</span><span class="o">.</span><span class="na">getBytes</span><span class="o">(),</span>
+        <span class="n">createTables</span><span class="o">,</span>
+        <span class="n">defaultTable</span><span class="o">);</span>
+
+<span class="n">AccumuloOutputFormat</span><span class="o">.</span><span class="na">setZooKeeperInstance</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="s">"myinstance"</span><span class="o">,</span>
+        <span class="s">"zooserver-one,zooserver-two"</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p><strong>Optional Settings:</strong></p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">AccumuloOutputFormat</span><span class="o">.</span><span class="na">setMaxLatency</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="mi">300000</span><span class="o">);</span> <span class="c1">// milliseconds</span>
+<span class="n">AccumuloOutputFormat</span><span class="o">.</span><span class="na">setMaxMutationBufferSize</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="mi">50000000</span><span class="o">);</span> <span class="c1">// bytes</span>
+</code></pre>
+</div>
+
+<p>The <a href="https://github.com/apache/accumulo-examples/blob/master/docs/mapred.md">MapReduce example</a>
+contains a complete example of using MapReduce with Accumulo.</p>
+
+<h2 id="combiners">Combiners</h2>
+
+<p>Many applications can benefit from the ability to aggregate values across common
+keys. This can be done via Combiner iterators and is similar to the Reduce step in
+MapReduce. This provides the ability to define online, incrementally updated
+analytics without the overhead or latency associated with batch-oriented
+MapReduce jobs.</p>
+
+<p>All that is needed to aggregate values of a table is to identify the fields over which
+values will be grouped, insert mutations with those fields as the key, and configure
+the table with a combining iterator that supports the summarizing operation
+desired.</p>
+
+<p>The only restriction on an combining iterator is that the combiner developer
+should not assume that all values for a given key have been seen, since new
+mutations can be inserted at anytime. This precludes using the total number of
+values in the aggregation such as when calculating an average, for example.</p>
+
+<h3 id="feature-vectors">Feature Vectors</h3>
+
+<p>An interesting use of combining iterators within an Accumulo table is to store
+feature vectors for use in machine learning algorithms. For example, many
+algorithms such as k-means clustering, support vector machines, anomaly detection,
+etc. use the concept of a feature vector and the calculation of distance metrics to
+learn a particular model. The columns in an Accumulo table can be used to efficiently
+store sparse features and their weights to be incrementally updated via the use of an
+combining iterator.</p>
+
+<h2 id="statistical-modeling">Statistical Modeling</h2>
+
+<p>Statistical models that need to be updated by many machines in parallel could be
+similarly stored within an Accumulo table. For example, a MapReduce job that is
+iteratively updating a global statistical model could have each map or reduce worker
+reference the parts of the model to be read and updated through an embedded
+Accumulo client.</p>
+
+<p>Using Accumulo this way enables efficient and fast lookups and updates of small
+pieces of information in a random access pattern, which is complementary to
+MapReduce’s sequential access model.</p>
+
+  </div>
+</div>
+
+        </div>
+
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+
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+
+  <p>Copyright © 2011-2017 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
+
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+
+
+      </div>
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+</body>
+</html>

http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/7b2eb317/docs/unreleased/development/development_tools.html
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+                
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+                
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+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/development_tools">Development Tools</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/sampling">Sampling</a></div>
+                
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+                
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+                
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+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/configuration-properties">Configuration Properties</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/kerberos">Kerberos</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/replication">Replication</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/fate">FATE</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/multivolume">Multi-Volume Installations</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/ssl">SSL</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+          
+        
+          
+        
+      
+        
+          
+        
+          
+        
+          
+        
+          
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsetroubleshooting" aria-expanded="false" aria-controls="collapsetroubleshooting">
+                  Troubleshooting
+                </a>
+              </h4>
+            </div>
+            <div id="collapsetroubleshooting" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/troubleshooting/overview">Overview</a></div>
+                
+              </div>
+            </div>
+          
+        
+      
+      </div>
+    </div>
+  </div>
+  <div class="col-md-9">
+    
+    <p><a href="/docs/unreleased/">Accumulo unreleased docs</a> &nbsp;&gt;&gt;&nbsp; Development &nbsp;&gt;&gt;&nbsp; Development Tools</p>
+    
+    
+    <h1>Development Tools</h1>
+    
+    <p>Normally, Accumulo consists of lots of moving parts. Even a stand-alone version of
+Accumulo requires Hadoop, Zookeeper, the Accumulo master, a tablet server, etc. If
+you want to write a unit test that uses Accumulo, you need a lot of infrastructure
+in place before your test can run.</p>
+
+<h2 id="mock-accumulo">Mock Accumulo</h2>
+
+<p>Mock Accumulo supplies mock implementations for much of the client API. It presently
+does not enforce users, logins, permissions, etc. It does support Iterators and Combiners.
+Note that MockAccumulo holds all data in memory, and will not retain any data or
+settings between runs.</p>
+
+<p>While normal interaction with the Accumulo client looks like this:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">Instance</span> <span class="n">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ZooKeeperInstance</span><span class="o">(...);</span>
+<span class="n">Connector</span> <span class="n">conn</span> <span class="o">=</span> <span class="n">instance</span><span class="o">.</span><span class="na">getConnector</span><span class="o">(</span><span class="n">user</span><span class="o">,</span> <span class="n">passwordToken</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<p>To interact with the MockAccumulo, just replace the ZooKeeperInstance with MockInstance:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">Instance</span> <span class="n">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="n">MockInstance</span><span class="o">();</span>
+</code></pre>
+</div>
+
+<p>In fact, you can use the <code class="highlighter-rouge">--fake</code> option to the Accumulo shell and interact with
+MockAccumulo:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>$ accumulo shell --fake -u root -p ''
+
+Shell - Apache Accumulo Interactive Shell
+-
+- version: 2.x.x
+- instance name: fake
+- instance id: mock-instance-id
+-
+- type 'help' for a list of available commands
+-
+
+root@fake&gt; createtable test
+
+root@fake test&gt; insert row1 cf cq value
+root@fake test&gt; insert row2 cf cq value2
+root@fake test&gt; insert row3 cf cq value3
+
+root@fake test&gt; scan
+row1 cf:cq []    value
+row2 cf:cq []    value2
+row3 cf:cq []    value3
+
+root@fake test&gt; scan -b row2 -e row2
+row2 cf:cq []    value2
+
+root@fake test&gt;
+</code></pre>
+</div>
+
+<p>When testing Map Reduce jobs, you can also set the Mock Accumulo on the AccumuloInputFormat
+and AccumuloOutputFormat classes:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="c1">// ... set up job configuration</span>
+<span class="n">AccumuloInputFormat</span><span class="o">.</span><span class="na">setMockInstance</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="s">"mockInstance"</span><span class="o">);</span>
+<span class="n">AccumuloOutputFormat</span><span class="o">.</span><span class="na">setMockInstance</span><span class="o">(</span><span class="n">job</span><span class="o">,</span> <span class="s">"mockInstance"</span><span class="o">);</span>
+</code></pre>
+</div>
+
+<h2 id="mini-accumulo-cluster">Mini Accumulo Cluster</h2>
+
+<p>While the Mock Accumulo provides a lightweight implementation of the client API for unit
+testing, it is often necessary to write more realistic end-to-end integration tests that
+take advantage of the entire ecosystem. The Mini Accumulo Cluster makes this possible by
+configuring and starting Zookeeper, initializing Accumulo, and starting the Master as well
+as some Tablet Servers. It runs against the local filesystem instead of having to start
+up HDFS.</p>
+
+<p>To start it up, you will need to supply an empty directory and a root password as arguments:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">File</span> <span class="n">tempDirectory</span> <span class="o">=</span> <span class="c1">// JUnit and Guava supply mechanisms for creating temp directories</span>
+<span class="n">MiniAccumuloCluster</span> <span class="n">accumulo</span> <span class="o">=</span> <span class="k">new</span> <span class="n">MiniAccumuloCluster</span><span class="o">(</span><span class="n">tempDirectory</span><span class="o">,</span> <span class="s">"password"</span><span class="o">);</span>
+<span class="n">accumulo</span><span class="o">.</span><span class="na">start</span><span class="o">();</span>
+</code></pre>
+</div>
+
+<p>Once we have our mini cluster running, we will want to interact with the Accumulo client API:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">Instance</span> <span class="n">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ZooKeeperInstance</span><span class="o">(</span><span class="n">accumulo</span><span class="o">.</span><span class="na">getInstanceName</span><span class="o">(),</span> <span class="n">accumulo</span><span class="o">.</span><span class="na">getZooKeepers</span><span class="o">());</span>
+<span class="n">Connector</span> <span class="n">conn</span> <span class="o">=</span> <span class="n">instance</span><span class="o">.</span><span class="na">getConnector</span><span class="o">(</span><span class="s">"root"</span><span class="o">,</span> <span class="k">new</span> <span class="n">PasswordToken</span><span class="o">(</span><span class="s">"password"</span><span class="o">));</span>
+</code></pre>
+</div>
+
+<p>Upon completion of our development code, we will want to shutdown our MiniAccumuloCluster:</p>
+
+<div class="language-java highlighter-rouge"><pre class="highlight"><code><span class="n">accumulo</span><span class="o">.</span><span class="na">stop</span><span class="o">();</span>
+<span class="c1">// delete your temporary folder</span>
+</code></pre>
+</div>
+
+  </div>
+</div>
+
+        </div>
+
+        
+<footer>
+
+  <p><a href="https://www.apache.org/foundation/contributing"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support the ASF" id="asf-logo" height="100" /></a></p>
+
+  <p>Copyright © 2011-2017 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
+
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+
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+</body>
+</html>

http://git-wip-us.apache.org/repos/asf/accumulo-website/blob/7b2eb317/docs/unreleased/development/high_speed_ingest.html
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+<!DOCTYPE html>
+<html lang="en">
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+        </div>
+        <div id="content">
+          
+          <div class="alert alert-danger" role="alert">This documentation is for an unreleased version of Apache Accumulo that is currently under development! Check out the <a href="/docs-1.8/">documentation for the latest release</a>.</div>
+
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+  <div class="col-md-3">
+    <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
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+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsegetting-started" aria-expanded="false" aria-controls="collapsegetting-started">
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+                </a>
+              </h4>
+            </div>
+            <div id="collapsegetting-started" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/design">Accumulo Design</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/clients">Accumulo Clients</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/shell">Accumulo Shell</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/table_design">Table Design</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/getting-started/table_configuration">Table Configuration</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+      
+        
+          
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsedevelopment" aria-expanded="true" aria-controls="collapsedevelopment">
+                  Development
+                </a>
+              </h4>
+            </div>
+            <div id="collapsedevelopment" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/iterator_design">Iterator Design</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/iterator_testing">Iterator Testing</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/development_tools">Development Tools</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/sampling">Sampling</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/summaries">Summary Statistics</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/security">Security</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/high_speed_ingest">High-Speed Ingest</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/development/analytics">Analytics</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+          
+        
+      
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseadministration" aria-expanded="false" aria-controls="collapseadministration">
+                  Administration
+                </a>
+              </h4>
+            </div>
+            <div id="collapseadministration" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/overview">Overview</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/configuration-management">Configuration Management</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/configuration-properties">Configuration Properties</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/kerberos">Kerberos</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/replication">Replication</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/fate">FATE</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/multivolume">Multi-Volume Installations</a></div>
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/administration/ssl">SSL</a></div>
+                
+              </div>
+            </div>
+          
+        
+          
+        
+          
+        
+          
+        
+          
+        
+      
+        
+          
+        
+          
+        
+          
+        
+          
+        
+          
+            <div class="panel-heading" role="tab" id="headingOne">
+              <h4 class="panel-title">
+                <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapsetroubleshooting" aria-expanded="false" aria-controls="collapsetroubleshooting">
+                  Troubleshooting
+                </a>
+              </h4>
+            </div>
+            <div id="collapsetroubleshooting" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingOne">
+              <div class="panel-body">
+                
+                
+                <div class="row doc-sidebar-link"><a href="/docs/unreleased/troubleshooting/overview">Overview</a></div>
+                
+              </div>
+            </div>
+          
+        
+      
+      </div>
+    </div>
+  </div>
+  <div class="col-md-9">
+    
+    <p><a href="/docs/unreleased/">Accumulo unreleased docs</a> &nbsp;&gt;&gt;&nbsp; Development &nbsp;&gt;&gt;&nbsp; High-Speed Ingest</p>
+    
+    
+    <h1>High-Speed Ingest</h1>
+    
+    <p>Accumulo is often used as part of a larger data processing and storage system. To
+maximize the performance of a parallel system involving Accumulo, the ingestion
+and query components should be designed to provide enough parallelism and
+concurrency to avoid creating bottlenecks for users and other systems writing to
+and reading from Accumulo. There are several ways to achieve high ingest
+performance.</p>
+
+<h2 id="pre-splitting-new-tables">Pre-Splitting New Tables</h2>
+
+<p>New tables consist of a single tablet by default. As mutations are applied, the table
+grows and splits into multiple tablets which are balanced by the Master across
+TabletServers. This implies that the aggregate ingest rate will be limited to fewer
+servers than are available within the cluster until the table has reached the point
+where there are tablets on every TabletServer.</p>
+
+<p>Pre-splitting a table ensures that there are as many tablets as desired available
+before ingest begins to take advantage of all the parallelism possible with the cluster
+hardware. Tables can be split at any time by using the shell:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>user@myinstance mytable&gt; addsplits -sf /local_splitfile -t mytable
+</code></pre>
+</div>
+
+<p>For the purposes of providing parallelism to ingest it is not necessary to create more
+tablets than there are physical machines within the cluster as the aggregate ingest
+rate is a function of the number of physical machines. Note that the aggregate ingest
+rate is still subject to the number of machines running ingest clients, and the
+distribution of rowIDs across the table. The aggregation ingest rate will be
+suboptimal if there are many inserts into a small number of rowIDs.</p>
+
+<h2 id="multiple-ingester-clients">Multiple Ingester Clients</h2>
+
+<p>Accumulo is capable of scaling to very high rates of ingest, which is dependent upon
+not just the number of TabletServers in operation but also the number of ingest
+clients. This is because a single client, while capable of batching mutations and
+sending them to all TabletServers, is ultimately limited by the amount of data that
+can be processed on a single machine. The aggregate ingest rate will scale linearly
+with the number of clients up to the point at which either the aggregate I/O of
+TabletServers or total network bandwidth capacity is reached.</p>
+
+<p>In operational settings where high rates of ingest are paramount, clusters are often
+configured to dedicate some number of machines solely to running Ingester Clients.
+The exact ratio of clients to TabletServers necessary for optimum ingestion rates
+will vary according to the distribution of resources per machine and by data type.</p>
+
+<h2 id="bulk-ingest">Bulk Ingest</h2>
+
+<p>Accumulo supports the ability to import files produced by an external process such
+as MapReduce into an existing table. In some cases it may be faster to load data this
+way rather than via ingesting through clients using BatchWriters. This allows a large
+number of machines to format data the way Accumulo expects. The new files can
+then simply be introduced to Accumulo via a shell command.</p>
+
+<p>To configure MapReduce to format data in preparation for bulk loading, the job
+should be set to use a range partitioner instead of the default hash partitioner. The
+range partitioner uses the split points of the Accumulo table that will receive the
+data. The split points can be obtained from the shell and used by the MapReduce
+RangePartitioner. Note that this is only useful if the existing table is already split
+into multiple tablets.</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>user@myinstance mytable&gt; getsplits
+aa
+ab
+ac
+...
+zx
+zy
+zz
+</code></pre>
+</div>
+
+<p>Run the MapReduce job, using the AccumuloFileOutputFormat to create the files to
+be introduced to Accumulo. Once this is complete, the files can be added to
+Accumulo via the shell:</p>
+
+<div class="highlighter-rouge"><pre class="highlight"><code>user@myinstance mytable&gt; importdirectory /files_dir /failures
+</code></pre>
+</div>
+
+<p>Note that the paths referenced are directories within the same HDFS instance over
+which Accumulo is running. Accumulo places any files that failed to be added to the
+second directory specified.</p>
+
+<p>See the <a href="https://github.com/apache/accumulo-examples/blob/master/docs/bulkIngest.md">bulk ingest example</a>
+for a complete example.</p>
+
+<h2 id="logical-time-for-bulk-ingest">Logical Time for Bulk Ingest</h2>
+
+<p>Logical time is important for bulk imported data, for which the client code may
+be choosing a timestamp. At bulk import time, the user can choose to enable
+logical time for the set of files being imported. When its enabled, Accumulo
+uses a specialized system iterator to lazily set times in a bulk imported file.
+This mechanism guarantees that times set by unsynchronized multi-node
+applications (such as those running on MapReduce) will maintain some semblance
+of causal ordering. This mitigates the problem of the time being wrong on the
+system that created the file for bulk import. These times are not set when the
+file is imported, but whenever it is read by scans or compactions. At import, a
+time is obtained and always used by the specialized system iterator to set that
+time.</p>
+
+<p>The timestamp assigned by Accumulo will be the same for every key in the file.
+This could cause problems if the file contains multiple keys that are identical
+except for the timestamp. In this case, the sort order of the keys will be
+undefined. This could occur if an insert and an update were in the same bulk
+import file.</p>
+
+<h2 id="mapreduce-ingest">MapReduce Ingest</h2>
+
+<p>It is possible to efficiently write many mutations to Accumulo in parallel via a
+MapReduce job. In this scenario the MapReduce is written to process data that lives
+in HDFS and write mutations to Accumulo using the AccumuloOutputFormat. See
+the MapReduce section under Analytics for details. The <a href="https://github.com/apache/accumulo-examples/blob/master/docs/mapred.md">MapReduce example</a>
+is also a good reference for example code.</p>
+
+  </div>
+</div>
+
+        </div>
+
+        
+<footer>
+
+  <p><a href="https://www.apache.org/foundation/contributing"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support the ASF" id="asf-logo" height="100" /></a></p>
+
+  <p>Copyright © 2011-2017 The Apache Software Foundation. Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
+
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+
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